SN54ABTH245, SN74ABTH245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS663D APRIL 1996 REVISED SEPTEMBER 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
State-of-the-Art
EPIC-
B
TM
BiCMOS Design
Significantly Reduces Power Dissipation
D
Latch-Up Performance Exceeds 500 mA Per
JESD 17
D
Typical V
OLP
(Output Ground Bounce) < 1 V
at V
CC
= 5 V, T
A
= 25
C
D
I
off
and Power-Up 3-State Support Hot
Insertion
D
High-Drive Outputs (32-mA I
OH
, 64-mA I
OL
)
D
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
D
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Thin Very Small-Outline (DGV) Packages,
Ceramic Chip Carriers (FK), Plastic (N) and
Ceramic (J) DIPs, and Ceramic Flat (W)
Package
description
These octal bus transceivers are designed for
asynchronous communication between data
buses. The devices transmit data from the A bus
to the B bus or from the B bus to the A bus,
depending on the logic level at the
direction-control (DIR) input. The output-enable
(OE) input can be used to disable the device so
the buses are effectively isolated.
When V
CC
is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 2.1 V, OE should be tied to V
CC
through a pullup resistor;
the minimum value of the resistor is determined by the current-sinking capability of the driver.
This device is fully specified for hot-insertion applications using I
off
and power-up 3-state. The I
off
circuitry
disables the outputs, preventing damaging current backflow through the device when it is powered down. The
power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The SN54ABTH245 is characterized for operation over the full military temperature range of 55
C to 125
C.
The SN74ABTH245 is characterized for operation from 40
C to 85
C.
Copyright
1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC-
B is a trademark of Texas Instruments Incorporated.
SN54ABTH245 . . . J OR W PACKAGE
SN74ABTH245 . . . DB, DGV, DW, N, OR PW PACKAGE
(TOP VIEW)
SN54ABTH245 . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
3
2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
A2
A1
DIR
B7
B6
OE
A8
GND
B8
V
CC
SN54ABTH245, SN74ABTH245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS663D APRIL 1996 REVISED SEPTEMBER 1999
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLE
INPUTS
OPERATION
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
logic symbol
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
B2
17
B3
16
B4
15
A5
6
A6
7
A7
8
A8
9
A2
3
A3
4
A4
5
OE
A1
2
G3
19
3 EN2 [AB]
B5
14
B6
13
B7
12
B8
11
B1
18
3 EN1 [BA]
1
DIR
1
2
logic diagram (positive logic)
DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
SN54ABTH245, SN74ABTH245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS663D APRIL 1996 REVISED SEPTEMBER 1999
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(except I/O ports) (see Note 1)
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or power-off state, V
O
0.5 V to 5.5 V
. . . . . . . . . . . . . . . . . . .
Current into any output in the low state, I
O
: SN54ABTH245 96
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ABTH245 128
mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0)
18 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0)
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): DB package
70
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DGV package
92
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DW package
58
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
69
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
83
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51.
recommended operating conditions (see Note 3)
SN54ABTH245
SN74ABTH245
UNIT
MIN
MAX
MIN
MAX
UNIT
VCC
Supply voltage
4.5
5.5
4.5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
VI
Input voltage
0
VCC
0
VCC
V
IOH
High-level output current
24
32
mA
IOL
Low-level output current
48
64
mA
t/
v
Input transition rise or fall rate
5
5
ns/V
t/
VCC
Power-up ramp rate
200
s/V
TA
Operating free-air temperature
55
125
40
85
C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
SN54ABTH245, SN74ABTH245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS663D APRIL 1996 REVISED SEPTEMBER 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
TA = 25
C
SN54ABTH245
SN74ABTH245
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.2
1.2
1.2
V
VCC = 4.5 V,
IOH = 3 mA
2.5
2.5
2.5
VOH
VCC = 5 V,
IOH = 3 mA
3
3
3
V
VOH
VCC = 4 5 V
IOH = 24 mA
2
2
V
VCC = 4.5 V
IOH = 32 mA
2*
2
VOL
VCC = 4 5 V
IOL = 48 mA
0.55
0.55
V
VOL
VCC = 4.5 V
IOL = 64 mA
0.55*
0.55
V
Vhys
100
mV
II
Control
inputs
VCC = 0 to 5.5 V,
VI = VCC or GND
1
1
1
A
I
A or B ports
VCC = 2.1 V to 5.5 V,
VI = VCC or GND
20
100
20
II(h ld)
VCC = 4 5 V
VI = 0.8 V
100
100
100
A
II(hold)
VCC = 4.5 V
VI = 2 V
100
100
100
A
IOZPU
VCC = 0 to 2.1 V,
VO = 0.5 V to 2.7 V, OE = X
50**
50**
50
A
IOZPD
VCC = 2.1 V to 0,
VO = 0.5 V to 2.7 V, OE = X
50**
50**
50
A
Ioff
VCC = 0,
VI or VO
4.5 V
100
100
A
ICEX
VCC = 5.5 V,
VO = 5.5 V
Outputs high
50
50
50
A
IO
VCC = 5.5 V,
VO = 2.5 V
50
140
180
50
180
50
180
mA
VCC = 5.5 V,
Outputs high
5
250
250
250
A
ICC
A or B ports
VCC = 5.5 V,
IO = 0,
Outputs low
22
30
30
30
mA
VI = VCC or GND
Outputs disabled
1
250
250
250
A
Data inp ts
VCC = 5.5 V,
One input at 3.4 V,
Outputs enabled
1.5
1.5
1.5
mA
ICC
Data inputs
,
Other inputs at
VCC or GND
Outputs disabled
1.5
1.5
1.5
mA
Control
inputs
VCC = 5.5 V, One input at 3.4 V,
Other inputs at VCC or GND
1.5
1.5
1.5
mA
Ci
Control
inputs
VI = 2.5 V or 0.5 V
4
pF
Cio
A or B ports
VO = 2.5 V or 0.5 V
8
pF
* On products compliant to MIL-PRF-38535, this parameter does not apply.
** On products compliant to MIL-PRF-38535, this parameter is not production tested.
All typical values are at VCC = 5 V.
Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
SN54ABTH245, SN74ABTH245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS663D APRIL 1996 REVISED SEPTEMBER 1999
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
TA = 25
C
SN54ABTH245
SN74ABTH245
UNIT
(INPUT)
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
tPLH
A or B
B or A
1
2
3.2
0.8
3.8
1
3.6
ns
tPHL
A or B
B or A
1
2.6
3.5
0.8
4.2
1
3.9
ns
tPZH
OE
A or B
2
3.5
4.5
1.2
6.2
2
5.6
ns
tPZL
OE
A or B
1.9
4
5.3
1.3
7
1.9
6.2
ns
tPHZ
OE
A or B
2.2
4.4
5.4
2.2
6.1
2.2
5.9
ns
tPLZ
OE
A or B
1.5
3
4
1
4.9
1.5
4.5
ns
tsk(o)
0.5
0.5
ns
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